| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information reproducing device which can be made low in profile and small in size. <P>SOLUTION: Light PL emitted by a semiconductor laser 3 passes through an opening 7, and is converted by a collimator lens 4a into parallel light, which is narrowed down into a linear converged beam by a cylindrical lens 5. The laser projection light PL while having its optical path bent by a reflecting prism 6 is stopped down into a linear converged beam, which is made incident on a core layer of a layer to be reproduced from a flank of a hologram memory medium 1. In the information reproducing device 100A, the incidence optical path from the semiconductor laser 3 to the cylindrical lens 5 is arranged on a detection optical path between the hologram memory medium 1 and a two-dimensional optical detector 2. Namely, the information reproducing device 100A has the incidence optical path and detection optical path arranged to be shared not only in terms of height positions, but also in three dimensions. <P>COPYRIGHT: (C)2007,JPO&INPIT |
